Typewriting machine



- 1,614,604 1927- w. A. DOBSON TYPEWRITING MACHINE Filed Sept. 4, 1926 Patented Jan, 18, 1927.

UNITED STATES PATENTOFFICE.

WILLIAM A. DOBSON, OF BRIDGEPORT, CONNECTICUT, ASSIGNOR TO UNDERWOOD TYPEWRITER COMPANY, OF NEW YORK, N. Y., A CORPORATION OF DELAWARE.

TYPEWRITING MACHINE.

Application filed September 4, 1926. Serial No. 133,585.

This invention relates to typewriting machines, the object being to eliminate some of the objections present in the construction shown in the patent granted to George WV. Campbell, March 1, 1921, 'No. 1,370,282, on which the present invention is an improvement.

In the above patent, there is shown a double-frame structure, including .n inner frame to support the mechanism and an outer finishing frame which are connected by screws passed outwardly through openings in the inner frame into threaded en- 'gagement with screw-holes in the outer frame. This is decidedly objectionable in the astembling operation, as the mechanic is compelled to operate the screw-driver or tool outwardly through the operative mechanism, which is a slow procedure.

The above patent also shows a sheet-metal built-up inner frame to support the mechanism. This frame is not altogether satisfactory as it does not possess the desired rigidity for hard usage as the vibration in the machine, when in operation, might tend to the possible loosening of the component parts of the frame, causing consequent disarrangement and improper coaction of the operative mechanism.

To provide a more substantial frame for portable typewriters, yet of reduced weight, the inner frame may be a cast unit preferably of aluminum with parallel skeleton sides connected at the rear by a cross-bar.

This frame may have integral projcetive portions for supporting the mechanism and for receiving fastening devices by which it is mounted within a unitary finishing and supporting frame which encloses it and conceals most of the mechanism.

The outer frame may be provided with integral projective portions on which the inner frame and its mechanism is supported and its wall may be formed with an nwardly-directed continuous overhanging flange.

An important feature of the present invention is found in the employment of means interposed between the frames, constituted by a pad or filler, of felt, asbestos or the like, for roviding a cushion packing to partially silence, deaden or lessen operating noise and obviate hollow sounds such as when air spaces are present.

Another feature of the invention resides in the improved construction of the parts 'wardly-directed 'the same will now be described more fully with reference to the accompanying drawing illustrating a preferred embodiment thereof.

Other features and advantages will hereinafter appear. v

In the accompanying drawing,

Figure 1 is a sectional side elevation'of the. improved frame with portions of an Underwood portable typewriter-mechanism indicated in dash-dot lines.

Figure 2 is a horizontal section of the improver portable typewriter-frame ona reduced scale and showing parts of the operativemechanism.

Figure 3 is a perspective view of the outer supporting and finishing member;

Referring to the drawing in detail, an outer unitary supporting and finishing frame 10, preferably an aluminum casting, is formed at the top with a continuous inoverhanging flange 11, under which may be arranged a fibrous pad 12, of soft yielding material, such as felt, asbestos, wool or the like, which has cutaway'portions through which inwardly-directed lugs 13 extend. A block 14 is formed integral with the rear. cross-bar of the frame 10 and is provided with a hole or bore 15,

and, below the block 1 1, there is an opening directed lugs 22 tosupport parts of the 0perative mechanism.

The inner frame is also provided with other oppositely-disposed inwardly-directed integral lugs 23 having threaded holes, whereby by means of suitable fastening devices, such as screws 24, which are passed p ardly thr gh the bore 1.7 in the l gs lUU 13, of theouter frame, and into threaded engagement with said holes, the frames may be firmly secured together in proper relation.

To firmly secure the frames together at the rear of the machine, I may pass a screw 25 through the bore 15 in the block 14 of the outer frame 10 and into threaded engagement with a screw-hole 26, provided in the cross-bar 20 of the inner frame.

I may 'also employ fastening devices for holding the composite frame and its operative mechanism to its base 27, one of such devices being shown at 28, in interlocking relation with the above-described opening 16, in the rear wall of the outer frame 10.

The parts of the typewriter-mechanism, indicated by dot and dash lines in Figure 1 of the drawing, include the character-keys 29, the platen 30, the platen-carriage 31, the type-bars 32 and the key-bars 33.

Variations may be resorted to within the scope of the invention, and portions of the improvements may be used without others.

Having thus described my invention, I claim:

1. A typewriter having a one-piece inner frame for carrying some of the working parts, a one-piece supporting frame therefor, means applicable from outside the structure for securing said frames together, and a soft padding disposed between the frames for the purpose set forth.

2. A typewriter having a two-part frame consisting of inner and outer members, each being formed of a single piece of light metal and arranged with parallel sides and backs, and a padding interposed therebetween for the purpose set forth.

3. A typewriter having a two-part frame.

consisting of inner and outer members, each being a one-piece casting, the inner member being formed with spaced ears and lugs to support parts of the working mechanism, the outer member being formed with a continuous overhanging flange, and a padding arranged under said flange and occupying the space between said frames at the back and sides thereof, and means whereby the frames may be firmly secured together from the'outside of the structure.

4. A typewriter having a double frame comprising inner and .outer members, each being a single-piece casting of light material arranged and firmly connected with parallel sides and backs, and a silencing and cushioning element interposed between said frames for the purpose set forth.

5. A typewriter having a double frame comprising inner and outer members, each of single piece construction and arranged With parallel side and back walls, means whereby fastening devices may be introduced from the outside of the frame-structure to firmly secure the members together at the sides and back, and a silencing element disposed between the members for the purpose set forth.

6. A typewriter having a double frame comprising inner and outer members, the inner member being a general support for the operative mechanism, the outer member being firmly secured thereto to support the same, each member being formed of a single piece of light metal.

7. A typewriter having a double frame comprising inner and outer members, the inner member being a general support for the operative mechanism, the outer member being firmly secured thereto to support the same, each of said members being a singlepiece casting of light metal, as aluminum.

8. A typewriter having an inner framemember supporting parts of the operative mechanism and being formed of a single piece of light metal, an outer one-piece frame-member firmly secured thereto by fastening devices applied from the outside of the structure, and a fibrous padding interposed between the frames for the purpose set forth.

9. A typewriter having a skeleton framemember formed of a single piece of light metal in which working parts of the machine may be mounted to operate, and a singlepieee aluminum outer frame-member secured to the skeleton member to support and conceal the same and the parts carried thereby, anda soft padding interposed between said frame-members for the purpose set forth.

10. A typewriter having a skeleton inner frame-member formed of a single piece of light metal and having integral projective portions on which some of the working parts are mounted and integral lugs having screwholes therein, an outer finishing frame of one-piece construction provided with perforated lugs corresponding to those of the inner frame, whereby suitable fastening devices may be applied from the outside of the structure to secure the frames together at the sides, means for securing the frames at the back, and a soft padding interposed between the frames for the purpose described.

WILLIAM A DOBSON. 

